Posted Sun Jan 26, 2014, 11:32am Subject: Re: First time poster! Looking to fix up an old Vibiemme Domobar...help!
I believe that the "Tee" brass part with the silicone hose coming off if it is the relief valve. There should be a screw slot on top that is the adjustment. BUT..
The scale on the pump's output indicates that there are other problems that need addressing. If I got that machine I would disassemble it and descale the boiler which I think you will find has a good scale deposit inside. The reson for disassembling it is that the scale will clog the machine (particularly the group's gicleur) if standard descaling procedures are followed.
Posted Sun Feb 2, 2014, 4:19am Subject: Re: First time poster! Looking to fix up an old Vibiemme Domobar...help!
There's no screw slot - where does one adjust OPV (or maybe pressure adjustment is somewhere else?) on this generation Domobar? Before I do any disassembling, I'd like to see if pressure adjustments change anything.
But it's interesting: I did a standard descale a month or so ago. I wonder if that actually exacerbated the pressure issues.
The OPV looks like the old Isomac type with the attached clear hose , remove the hose and cover the barrel so it doesn't get damaged & turn the brass barrel with pliers clockwise to increase pressure. If you look carefully you can see a round lip edge at the end of the hose which sometimes you can grab it there with the pliers to adjust.
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